The main factors affecting the hydration
Breeding and moulting show a significant seasonality. The main factors influencing the breeding and moulting of leech are the lighting conditions. The four seasons have distinct photoperiodic changes, which are conducive to the breeding and moulting of leech, followed by nutrition and temperature, etc. envirnmental factor.
Lighting conditions. The quail is a seasonally-producing mammal, and it is a fur animal that is twice a year seasonally. This seasonal reproduction and molting is due to the fact that the otters live in areas above 45 degrees north latitude, long-term adaptation to the environmental conditions in such high latitude areas, and the natural selection and genetic adaptation to become leeches. A prominent ethnic feature. Since the watercress ancestors lived in high latitudes for a long time, its physiological activities such as metabolism, growth and development, reproduction, and molting established a close relationship with the periodicity of high latitudes, especially as a trigger signal for realizing the reproductive and moulting cycles of leech. Necessary conditions. There is also a close relationship between interdependence and restriction between the reproductive cycle and the hair replacement cycle.
After the autumnal equinox, the reproductive organs of the otter begin to develop slowly. At the same time, the summer hair falls off and the winter hair grows. Here, the equinox signal seems to play a "boarder" role. Since then, with the shortening of the sunshine time, after about 70 days to 80 days, the winter hairs have developed and matured, indicating that the hair removal hairs are a short-day response. After the vernal equinox, the sunshine duration continued to increase, and the daytime began longer than the night. The winter hair falls off and the summer hair grows. Here, the vernal equinox seems to play a "boarder" role. After the vernal equinox, the emergence of summer hairs until the summer hair is mature is a long-day response.
Artificially controlling photoperiod changes to change the large number of scientific trials of leeches reproductive and molting cycles, theoretically further reveals the inherent laws closely related to the photoperiodic variation rules and the cycle of reproduction and hair replacement. When shaggy hair grows or completes growth, artificially shortening the time of daily light can accelerate the shedding of summer hair and start the growth of winter hair, but the speed of growth and development of winter hair is constant, and has nothing to do with the date of shortening the light time. . After the equinox signal is given, with the shortening of the illumination time, the summer hair begins to fall off and the winter hair begins to grow. From the time when the equinox signal is given to the completion of winter hair growth, it takes 80 days to 90 days.
In recent years, with the gradual understanding and mastery of the laws governing the change of the photoperiod, the related laws of the leeches reproductive cycle and the wool-changing cycle, and the application of these laws to the production practice of raising fleas, remarkable results have been achieved. The maturity of mink winter hair is generally from late November to early December. It has been proved that as long as the summer hair grows, regardless of whether it is mature or not, artificially give the autumnal signal, and then gradually shorten the daily sunshine time, after 80 days to 90 days, the winter hair can be mature. Therefore, winter hairs can be matured and peeled in advance by controlling the phototrophs or implanting melanin.
Nutritional level. The basic substances necessary for vital activities such as metabolism, growth and development, reproduction, and molting are called nutrients. It includes proteins, fats, carbohydrates, vitamins, minerals and moisture. There are many types of feeds used to raise leeches, and various nutrients and feed quality are also different. These have a direct impact on the growth, development, reproduction, and molting of leeches. Different feeds and feeding systems can produce different production effects. Therefore, feed nutrition is closely related to the production effect of leeches. By fully understanding the physiological functions of various nutrients, the amounts of various nutrients contained in various feeds, and the nutritional value thereof, we can scientifically and economically formulate the diet of leech so as to give full play to the production performance of the leech and achieve the raising of the leech. The intended purpose. Mink malnutrition during molting period will cause the summer hairs to fall off, the winter furs grow insufficiency, white velvet, eating hair, self-biting and other conditions, which will seriously affect the quality of the fur.
Climatic conditions. The level of temperature will affect the density of the needle hair, light intensity will affect the depth of the coat, bad weather conditions will affect the length of the hair and peace.
Variety types and individual differences. Different types of leeches have great differences in their plush quality. Only the fine varieties of leeches can produce high-quality fur. Different types of leeches have different winter maturation periods, and generally the colors are lighter and mature. early. There are differences between different individuals' water-for-mossing, sooner or later, and mature ones. In general, mother-mothers mature earlier than male-five-olds, mature-matured cockroaches mature earlier than young-matured cockscombs, and better-matched cicada winter hairs mature earlier.
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